Critical Apache HTTP/2 Flaw (CVE-2026-23918) Enables DoS and Potential RCE
Critical Apache HTTP/2 Flaw (CVE-2026-23918) Enables DoS and Potential RCE — Ravie LakshmananMay 05, 2026Vulnerability / Server Security [https://blogger.go
What’s new: A critical vulnerability in Apache HTTP Server, tracked as CVE-2026-23918 (CVSS score: 8.8), has been identified. This flaw, affecting version 2.4.66, can lead to denial-of-service (DoS) and potential remote code execution (RCE) through improper handling of HTTP/2 protocol. The issue has been addressed in version 2.4.67.
Who’s affected
Users of Apache HTTP Server 2.4.66 with mod_http2 enabled are at risk. The vulnerability is particularly concerning for deployments using the Apache Portable Runtime (APR) with the mmap allocator, which is common in Debian-derived systems and official Docker images.
What to do
- Upgrade to Apache HTTP Server version 2.4.67 or later to mitigate the vulnerability.
- Review server configurations to ensure mod_http2 is properly secured.
- Monitor for any unusual activity that may indicate exploitation attempts.
